Keyboard of ORAC MK3 only partialy responds to comands

[asto]

Hi Asto,
I do realize my reply comes a bit late but hope it still hell you...
The problem you are describing sounds to me like the rubbon cable connecting the keypad to the main board is either partially disconnected or damaged.
Power off the machine, open up the base and check the connections.

RNR

Thanks for the reply RNR. I'm affraid I've done this already. And I have found one row of the matrix not responding to commands but the rest of the buttons should be able sending the codes to the controler. This is a very simple membrane key board with 4 or 5 layers of contacts separated with polyethylene membranes.
If I could find one from an old machine owner who plans to upgrade the ORAC would be great but so far nobody seems yo posess one.
But I also suspect board PC1690 is in trouble. And so far i've not managed to meet someone who wants to sell this old board.
I will keep searching the classifieds who knows something happens in the near future.
Thanks for the advise anyway.

Kind regards

Dimitri